Interesting.

Sale 1: Sold for Stormy Storm Voodoo Juju[22.5 keys via mini]

http://backpack.tf/profiles/76561198138873761/#!/compare/1457078400/1457164800

22.5 rounding to 23 keys

Sale 2: Sold with 2 other unusuals for Peace Modest

http://backpack.tf/profiles/76561198065057392/#!/compare/1455177600/1455782400

Should be used to price the modest[even though I personally think it's an outlier]

Sale 3: Sold for Strange Professional Killstreak Festive Crusader's Crossbow[12 keys via mini]+ Strange Professional Killstreak Hitman's Heatmaker[4 keys via mini]+ Taunt: Zoomin' Broom[2 keys]+ Taunt: Mannrobics[2 keys]+ a key+ sweets adding up to around 3 keys~

http://backpack.tf/profiles/76561198205799924/#!/compare/1456646400/1456732800

12+4+2+2+1+3=24 keys

Mini on Voodoo Juju:

http://backpack.tf/vote/id/56f4a81ec4404560552c7c6c

Mini on Crossbow:

Sellers at 12 keys https://gyazo.com/6065f9b49ec2f6ac6663597c658d8c7a.png

Mini on Hitman's Heatmaker:

Sellers at 4 keys https://gyazo.com/6f559e54642bdb3a0bb950b9b7026d71.png

So I have sales at 23 and 24 keys, making this a range of 23-24 keys.